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Derivative Instruments (Effect Of Derivative Instruments Designated As Fair Value Hedges And Underlying Hedged Items On Consolidated Statements Of Operations Summary) (Details) (Derivatives Designated As Fair Value Hedging Instruments [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
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Oct. 26, 2013
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Oct. 27, 2012
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|
| Hedge Underlying Gain Loss [Line Items] | ||
| Gains (losses) on derivative instruments | $ (17) | $ (21) |
| Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | 15 | 21 |
|
Equity Contract [Member] | Other income (loss), net [Member]
|
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| Hedge Underlying Gain Loss [Line Items] | ||
| Gains (losses) on derivative instruments | (35) | (3) |
| Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | 35 | 3 |
|
Interest Rate Contract [Member] | Interest Expense [Member]
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| Hedge Underlying Gain Loss [Line Items] | ||
| Gains (losses) on derivative instruments | 18 | (18) |
| Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | $ (20) | $ 18 |